add anchor tag for cards and remove link from div (pytorch/tutorials#1511)

Author: 9bow

custom_directives.py

@@ -266,7 +266,9 @@ def run(self):
 
     <div class="col-md-12 tutorials-card-container" data-tags={tags}>
 
-    <div class="card tutorials-card" link={link}>
+    <div class="card tutorials-card">
+
+    <a href="{link}">
 
     <div class="card-body">
 
@@ -282,6 +284,8 @@ def run(self):
 
     </div>
 
+    </a>
+
     </div>
 
     </div>